Tsz Wo (Nicholas), SZE created HDFS-5889:
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Summary: When rolling upgrade is in progress, standby NN should
create checkpoint for downgrade.
Key: HDFS-5889
URL: https://issues.apache.org/jira/browse/HDFS-5889
Project: Hadoop HDFS
Issue Type: Sub-task
Components: namenode
Reporter: Tsz Wo (Nicholas), SZE
Assignee: Tsz Wo (Nicholas), SZE
After rolling upgrade is started and checkpoint is disabled, the edit log may
grow to a huge size. It is not a problem if rolling upgrade is finalized
normally since NN keeps the current state in memory and it writes a new
checkpoint during finalize. However, it is a problem if admin decides to
downgrade. It could take a long time to apply edit log. Rollback does not
have such problem.
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